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When he was 8, he read his first book on finance. When he was 16, he asked his mom for a brokerage account. At 23, Isaiah Lopez has just launched his own company, an on-demand notary-signing platform.

Question: It was determined by a doctor that my mother had Alzheimer’s. About three months after the determination, my brother took her to a notary and had her sign a power of attorney giving him ...